A majority of infants with persistent neonatal middle ear effusion found by pneumatic otoscopy at 30 to 48 hours will develop chronic otitis media with effusion during the first year of life. However, chronic otitis media with effusion is common in all infants (20% of controls), a time during which infants are examined and tested frequently.
Summary The main subject of this hospital-based case-control study was al., 1972, 1973Nelson & Kelly, 1976; IARC, 1979 In Table I, relative risks of breast cancer in relation to various previously recognised risk factors for this disease are shown. As expected, risk is seen to increase in women with a
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